Enter an IQ score to see where it falls on the normal distribution: the percentile and roughly how common that score is.
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IQ scores follow a normal distribution with a mean of 100 and a standard deviation of 15. The calculator measures how many standard deviations your score is from the mean, then uses the normal curve to convert that distance to a percentile and a rarity estimate.
The calculator finds how many standard deviations your score sits from the mean (z-score), then maps that to a percentile using the normal distribution. A score of 115 is one standard deviation above the mean, which puts it at about the 84th percentile.
A 130 IQ is two standard deviations above the mean on the standard 15-SD scale, which puts it at roughly the 98th percentile. About 2 people in 100 score at that level or higher.
No. It converts a score you already have into a percentile. Real IQ testing is administered by a licensed psychologist under controlled conditions.
Most modern IQ tests (the Wechsler scales, for example) use a mean of 100 and a standard deviation of 15. A few older or specialized tests use 16 or 24.
By definition, the mean is 100. About 68 percent of people score between 85 and 115, which is one standard deviation on either side of the mean.